In thermal oil circulation systems, the surface heat load of an electric heater directly affects heat transfer efficiency and equipment lifespan. Excessive surface heat load can cause local coking of the thermal oil, while too low a load results in bulky equipment and increased costs. According to the GB/T 24589.3 standard, the design of explosion-proof electric heaters must balance thermal performance and explosion-proof safety, typically controlling the surface heat load between 1.5 and 2.5 W/cm². The FBD-320 explosion-proof electric heater (thermal oil electric heater equipment) is designed with a reasonable power density to meet this requirement, making it suitable for auxiliary heating in thermal oil boilers or independent circulation heating scenarios.
The material of the heating tube is a key factor determining the service life of the equipment. 800 stainless steel contains approximately 30% nickel and exhibits good oxidation and carburization resistance at high temperatures; 840 stainless steel contains approximately 20% nickel and offers better corrosion resistance than 304 stainless steel (which contains approximately 8% nickel). The heating tubes of the FBD-320 explosion-proof electric heater can be made of 800, 840, or 316L stainless steel. Procurement personnel should select the appropriate material based on thermal oil quality, operating temperature, and environmental corrosiveness to avoid premature failure due to material mismatch.
The main technical parameters of the FBD-320 explosion-proof electric heater include: rated voltage 380V, explosion-proof grade ExdⅡCT4, protection grade IP65, operating temperature ≤350°C, and design pressure 1.6MPa. The heating power can be customized according to system heat load requirements, with a single-unit power range of 30 to 200 kW. The equipment is equipped with temperature sensors and overheat protection devices to ensure timely power cutoff in case of insufficient thermal oil flow or overtemperature.
